JPH1064062A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the increase of a defective sector and to maintain the reliability of an optical disk by recording the data and the recorded data of the sector of an adjacent groove in the radial direction of the optical disk into the sector of an alternate zone in the case of successively detecting errors of two bytes or more. SOLUTION: When data from the sector within the recorded zone are reproduced, an alternate control signal is fed to a CPU 30 via a bus 29 in the case of successively detecting errors of two bytes or more with an error correcting circuit 32. The sector is judged to be a defective sector with the CPU 30, errors of data of the sector are corrected with the error correcting circuit 32, thereafter the data are recorded into the alternate sector, and the sector number within the alternate zone to the sector number within the recording zone is stored into an alternate sector control table 2b. Also, the sector adjacent to the defective sector is judged to be unusable as well with the CPU 30, the sector data are reproduced and recorded into the alternate sector within the alternate zone, and the sector number is stored into the control table 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for recording data on an optical disk of a phase change system and reproducing data recorded on the optical disk.

[0002]

2. Description of the Related Art In recent years, optical disk devices for recording data on a phase change type optical disk in sector units and reproducing data recorded on the optical disk in sector units have been put to practical use.

In such an optical disc, data recording and erasing of recorded data can be repeatedly performed (overwritten). When a defect occurs in a predetermined groove or land, recording and recording are performed. In order to prevent a defect occurring in the groove or land from being increased by repetition of erasure, a sector-by-sector replacement process for recording data in a replacement area is performed. As a result, the growth of defects in the radial direction of the sector is prevented.

In order to record data at high density,
Data is recorded on both spiral and concentric grooves and lands, and the pitch of the grooves and lands in the radial direction of the optical disk is becoming very narrow.

[0005] For this reason, merely performing a sector-by-sector replacement process on a groove or land where a defect has occurred is used to record data on a land or groove radially adjacent to the groove or land where the defect has occurred. By repeatedly performing and erasing, the defect grows in the radial direction (outside and inside of the optical disk) and becomes large, the number of sectors in which the defect exists increases, and the reliability of the optical disk decreases. There are drawbacks.

For example, a defect occurs by overwriting a sector having a groove (or a land), and a defect grows by repeatedly overwriting a sector having a defect from the beginning. This growth occurs not only in the radial direction of the sector but also in the radial direction. Then, a defect grows in a sector of an adjacent land (groove), and this becomes a seed of a defect. When overwriting is performed again, the defect grows and spreads further outside and inward. The sector where the data exists is spread, and the reliability of the optical disc is reduced.

[0007]

As described above, data is recorded in sector units on both lands and grooves.
In an optical disc in which data recording and erasing of recorded data are repeatedly performed, defects grow in the radial direction and become large, the number of sectors in which defects are present increases, and the reliability of the optical disc decreases. It is an object of the present invention to provide an optical disk device which eliminates defects, prevents growth of defects in the radial direction, suppresses an increase in sectors having defects, and does not impair the reliability of the optical disk. And

[0008]

SUMMARY OF THE INVENTION An optical disk apparatus according to the present invention has a groove and a land for recording spiral or concentric data, and is composed of a fixed length groove or land, and a header on which address data is recorded. A plurality of sectors each including a recording area and a data area in which data is recorded. Data is recorded on an optical disc including a recording area including a plurality of sectors and an alternative area including a plurality of sectors. A reproducing means for reproducing data recorded in the data area of the sector, a detecting means for detecting an error of data in a byte unit reproduced by the reproducing means, and a reproducing means for reproducing the data recorded in the data area of the sector. While the data recorded in the sector of the recording area is being reproduced, the detection means continuously connects the data. If when detecting two or more bytes of the error, and records the data recorded in the sector in which the error has occurred in the sector of the spare area, sector in which the error has occurred corresponds to the land,
The data recorded in the sector of the groove radially adjacent to the optical disk is also recorded in the sector of the substitute area, or when the sector where the error occurs corresponds to the groove, the data of the land adjacent to the radial direction of the optical disk is recorded. The data recorded in the sector is also constituted by processing means for recording the data in the sector in the substitute area.

An optical disk device according to the present invention has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and has a header section on which address data is recorded and data on which a data is recorded. A plurality of sectors each including a plurality of data areas, and record data on an optical disk including a recording area including a plurality of sectors and an alternative area including a plurality of sectors, and reproduce data recorded on the optical disk. Reproducing means for reproducing data recorded in the data area of the sector, detecting means for detecting an error in data in byte units reproduced by the reproducing means, and recording in the sector of the recording area by the reproducing means. When playing back the data that has been read, the detection means continuously outputs an error of 2 bytes or more. When the error is detected, the data recorded in the sector where the error occurred is recorded in the sector of the replacement area, and when the sector where the error occurs corresponds to the land, it is adjacent in the radial direction of the optical disc. The data recorded in the sector of the groove to be recorded is also recorded in the sector of the substitute area, or when the sector where the error has occurred corresponds to the groove, the data is recorded in the sector of the land adjacent in the radial direction of the optical disk. It is composed of processing means for recording data also in the sector of the replacement area, and storage means for storing the correspondence between the sector of the recording area whose data recording position has been changed by this processing means and the sector of the replacement area.

An optical disk apparatus according to the present invention has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and has a header section on which address data is recorded and a header section on which data is recorded. A plurality of sectors each including a plurality of data areas, and record data on an optical disk including a recording area including a plurality of sectors and an alternative area including a plurality of sectors, and reproduce data recorded on the optical disk. Recording means for recording data in a data area of a sector in the recording area in byte units; reproducing means for reproducing byte-based data recorded in the data area of the sector by the recording means; Detecting means for detecting an error in byte-level data reproduced by the method, and the detecting means When the recorded data is reproduced immediately after recording and an error of 2 bytes or more is continuously detected, the data recorded in the sector where the error has occurred is recorded in the sector of the replacement area, and the sector where the error has occurred is recorded. If the sector corresponds to the land, the data recorded in the sector of the groove adjacent to the radial direction of the optical disc is also recorded in the sector of the substitute area, or if the sector where the error occurs corresponds to the groove, the optical disc The data recorded in the sector of the land adjacent in the radial direction is also constituted by processing means recorded in the sector of the replacement area.

An optical disk apparatus according to the present invention has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and has a header section on which address data is recorded and data on which a header is recorded. A plurality of sectors each including a plurality of data areas, and record data on an optical disk including a recording area including a plurality of sectors and an alternative area including a plurality of sectors, and reproduce data recorded on the optical disk. Recording means for recording data in a data area of a sector in the recording area in byte units; reproducing means for reproducing byte-based data recorded in the data area of the sector by the recording means; Detecting means for detecting an error in the data in byte units reproduced by When the recording data is reproduced immediately after recording and an error of 2 bytes or more is continuously detected, the data recorded in the sector where the error has occurred is recorded in the sector of the replacement area, and the sector where the error has occurred is recorded. If it corresponds to a land, data recorded in a sector of a groove adjacent in the radial direction of the optical disc is also recorded in a sector of the alternative area, or if the sector where the error occurs corresponds to the groove, Processing means for recording data to be recorded in radially adjacent sectors of the land in the sectors of the alternative area, and correspondence between the sectors of the recording area whose data recording position has been changed by the processing means and the sectors of the alternative area It is composed of storage means for storing the relationship.

An optical disk device according to the present invention has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and has a header section on which address data is recorded and data on which a header section is recorded. A plurality of sectors each including a plurality of data areas, and record data on an optical disk including a recording area including a plurality of sectors and an alternative area including a plurality of sectors, and reproduce data recorded on the optical disk. A reproducing means for reproducing data recorded in the data area of the sector, a detecting means for detecting an error of data in a byte unit reproduced by the reproducing means, a land or a groove of the recording area by the reproducing means. When the data recorded in the sector is being reproduced, Subsequently, when an error of 2 bytes or more is detected, the data recorded in the groove or land sector adjacent in the radial direction of the optical disk is reproduced by the reproducing means, and the error of 1 byte or more is detected by the detecting means. Judgment means for judging whether or not to detect, and when an error of one byte or more is detected by this judgment means, the data recorded in the sector in which the error of two or more bytes has occurred consecutively is replaced with an alternative area. And the data recorded in a sector of a groove or a land adjacent to the sector in the radial direction of the optical disk.

An optical disk apparatus according to the present invention has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and has a header section on which address data is recorded and a header section on which data is recorded. A plurality of sectors each including a plurality of data areas, and record data on an optical disk including a recording area including a plurality of sectors and an alternative area including a plurality of sectors, and reproduce data recorded on the optical disk. A reproducing means for reproducing data recorded in the data area of the sector, a detecting means for detecting an error of data in a byte unit reproduced by the reproducing means, a land or a groove of the recording area by the reproducing means. When the data recorded in the sector is being reproduced, Subsequently, when an error of 2 bytes or more is detected, the data recorded in the groove or land sector adjacent in the radial direction of the optical disk is reproduced by the reproducing means, and the error of 1 byte or more is detected by the detecting means. Judgment means for judging whether or not to detect. When an error of 1 byte or more is detected by this judgment means,
The data recorded in the sector where an error of 2 bytes or more has occurred consecutively is recorded in the sector of the substitute area, and the data recorded in the groove or land sector adjacent to the sector in the radial direction of the optical disk. Also includes processing means for recording data in the sector of the substitute area, and storage means for storing the correspondence between the sector of the recording area in which the data recording position has been changed by this processing means and the sector of the substitute area.

An optical disk device according to the present invention has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and has a header section on which address data is recorded and data on which a data is recorded. A plurality of sectors each including a plurality of data areas, and record data on an optical disk including a recording area including a plurality of sectors and an alternative area including a plurality of sectors, and reproduce data recorded on the optical disk. Recording means for recording data in a data area of a sector in the recording area in byte units; reproducing means for reproducing byte-based data recorded in the data area of the sector by the recording means; Detecting means for detecting an error in the data in byte units reproduced by When the recorded data is reproduced immediately after recording and an error of 2 bytes or more is continuously detected, the data recorded in the groove or land sector adjacent in the radial direction of the optical disk is reproduced by the reproducing means. Means for judging whether or not an error of 1 byte or more is detected by the means, and when the error of 1 byte or more is detected by the judgment means, the sector in which the error of 2 bytes or more has occurred consecutively is detected. Processing means for recording data to be recorded in a sector of the alternative area and recording data recorded in a groove or land sector adjacent to the sector in the radial direction of the optical disc in the sector of the alternative area. .

The optical disk device of the present invention has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and has a header portion on which address data is recorded and data on which a data is recorded. A plurality of sectors each including a plurality of data areas, and record data on an optical disk including a recording area including a plurality of sectors and an alternative area including a plurality of sectors, and reproduce data recorded on the optical disk. Recording means for recording data in a data area of a sector in the recording area in byte units; reproducing means for reproducing byte-based data recorded in the data area of the sector by the recording means; Detecting means for detecting an error in the data in byte units reproduced by When the recorded data is reproduced immediately after recording and an error of 2 bytes or more is continuously detected, the data recorded in the groove or land sector adjacent in the radial direction of the optical disk is reproduced by the reproducing means. Means for judging whether or not an error of 1 byte or more is detected by the means, and when the error of 1 byte or more is detected by the judgment means, the data is recorded in the sector where the error of 2 bytes or more has occurred continuously. Processing means for recording the data to be recorded in the sector of the alternative area, and also recording the data recorded in the sector of the groove or land adjacent to the sector in the radial direction of the optical disk, and the processing means. Storage means for storing a correspondence relationship between a sector of a recording area where a data recording position is changed and a sector of an alternative area Are al configuration.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical disk device. This optical disk apparatus performs recording of data, reproduction of recorded data, or erasing of recorded data on the optical disk 1 by using focused light.

The optical disk 1 is a rewritable disk of a phase change type. As shown in FIG. 2, for example, a substrate made of glass or plastics material (for example, polymethyl methacrylate resin or polycarbonate resin) is formed in a circular shape. A recording layer 42 formed by a deposition method such as vacuum deposition or sputtering and a protective layer 43 made of an inorganic dielectric are formed on the surface 41. This protective layer 43
It may be composed of an organic protective film such as an ultraviolet curable resin.

Using such an optical disk 1, for example, recording / erasing can be performed as follows. First, the optical disk 1 is irradiated with laser beam light and heated to bring the recording layer into a state of high crystallinity (a state in which primitives are relatively correctly arranged, hereinafter referred to as a crystalline state).

Next, for writing data, the recording layer is heated and quenched by irradiating a short intense pulsed laser beam light. Then, the irradiated portion of the pulsed laser beam light is in a state where crystallinity is reduced (a state in which the atomic arrangement is disturbed, hereinafter referred to as amorphous). Since the structure of the atomic arrangement is different between the crystalline state and the amorphous state, the optical properties (transmittance and reflectivity) change and data can be recorded. In this way, the written data can be erased by irradiating the recording unit with a long weak pulse light and heating and gradually cooling. This is because the recording unit returns to the original crystalline state.

The optical disk 1 is, as shown in FIG.
It is divided in the radial direction into a plurality of zones 1a,. Each zone 1
The clock signals for a,.
The rotation speed (speed) of the optical disc 1 with respect to a,... is different from each other (slower as going from the inner circumference to the outer circumference), and the number of sectors per track differs in each zone 1a,. It has become. The relationship between the speed data as the number of revolutions for each of the zones 1a,... And the number of sectors per track is recorded in the speed table 2a of the memory 2 as shown in FIG.

[0021] Each zone 1a of the optical disk 1, the ... tracks includes a header portion 1 _1, each address and the like are recorded, ... are previously pre-formatted for each sector.

The optical disk 1 has a recording area including a plurality of sectors and an alternative area including a plurality of sectors. The header portion 1 _1, as shown in FIG. 5, and is formed at the boundary of the groove and a land (adjacent in the radial direction of the optical disc 1). In other portions, as shown in FIGS. 6A and 6B, recording data as recording marks is recorded on each of the groove and the land.

The header ₁₁ is formed at the time of forming the groove. As shown in FIG. 5, this header portion is composed of a plurality of pits 101, and is preformatted with respect to the groove 102 as shown in the figure.
And the land 103 are located on the same line as the tangent line.

As shown in FIG. 5, the pit string ID1 is the header of the groove 1, the pit string ID2 is the header of the land 1, the pit string ID3 is the header of the groove 2, the pit string ID4 is the header of the land 2, The pit string ID5 is a header part of the groove 3, and the pit string ID6 is a header part of the land 3.

FIG. 7 shows a format for each sector of each zone 1a,... Of the optical disc 1. As shown in FIG. In FIG. 7, one sector is 2697 bytes (byte)
s) and a 128-byte header area (header part 1
₁ ), a 5-byte mirror mark area, and a 2,564-byte recording area.

The channel bits recorded in the sector have a format in which 8-bit data is modulated into 16-bit channel bits by 8-16 code. The header area is an area where predetermined data is recorded when an optical disc is manufactured. This header area is composed of four address areas PID1, PID2, PID3, and PID4.

Each of the address areas PID1 to PID4 is composed of 46 bytes or 18 bytes, and a synchronization code portion VFO (Variable Frequency O) of 36 bytes or 8 bytes.
scillator), 3-byte address mark AM (Addres
s Mark), 4-byte address part PID (Position Ide)
ntifier), 2-byte error detection code IED (ID Err
or Detection Code) 1 byte postamble PA
(Postambles).

Address areas PID1 and PID3 are 36
It has a byte synchronization code part VFO1 and has an address area P
ID2 and PID4 are an 8-byte synchronization code part VFO2
have.

The synchronous code portions VFO1 and VFO2 are regions for pulling in the PLL. The synchronous code portion VFO1 records a sequence of "010 ..." in channel bits for "36" bytes (646 bits in channel bits). (Recording a pattern at a fixed interval), and the synchronization code portion VFO
Reference numeral 2 denotes a sequence of “010...” Of channel bits recorded for “8” bytes (128 bits of channel bits).

The address mark AM is a "3" byte synchronization code indicating where the sector address starts. As a pattern of each byte of the address mark AM, a special pattern which does not appear in the data portion of "0100100000000100" is used.

Address parts PID1 to PID4 are sector addresses (including ID numbers) as 4-byte address information.
Is an area where is recorded. The ID number is, for example, PI
In the case of D1, it is "1" and is a number representing the number of the overwriting four times in _one header section 11.

The error detection code IED is an error (error) detection code for the sector address (including the ID number).
It is possible to detect the presence or absence of an error in the read PID.

The postamble PA includes a state information necessary for demodulation and has a role of poling as the header portion 1 ₁ is completed by a space. The mirror mark area is
It is used for offset correction of a track difference signal, timing generation of a land / groove switching signal, and the like.

The recording area includes a gap area of 17 to 19 bytes, a VFO3 area of 50 bytes, a data area of 2418 bytes, a guard data area of 30 bytes, and 47 bytes.
It consists of a buffer area of up to 49 bytes.

The gap area is an area where nothing is written. The VFO3 area is also an area for PLL lock,
It is also an area where a synchronization code is inserted in the same pattern to synchronize byte boundaries.

The data area includes a synchronization code, an ECC (Erro
r Collection Code), EDC (Error Detection Cod)
e) An area composed of user data and the like. The user data is recorded in byte units, and has parity check data in the byte units. Byte-level errors can be detected by the parity check data.

The guard data area is an area provided to prevent the end deterioration at the time of repetitive recording peculiar to the phase change recording medium from reaching the data area. Buffer area, so that the data area is not applied to the next header portion 1 _1, which is an area provided for absorbing and rotation fluctuation of the motor for rotating the optical disc 1.

The reason why the gap area is expressed as 17 to 19 bytes is that a random shift is performed. The random shift is to shift the data write start position in order to reduce the repetitive recording deterioration of the phase change recording medium. The length of the random shift is adjusted by the length of the buffer area located at the end of the data area, and the entire length of one sector is fixed at 2697 bytes.

In FIG. 1, the optical disk 1 is rotated by a motor 3 at a different rotation speed for each zone, for example. The motor 3 is controlled by a motor control circuit 4. Recording and reproduction of data on the optical disk 1 are performed by the optical head 5. The optical head 5 is
The linear motor 6 is fixed to a drive coil 7 constituting a movable portion, and the drive coil 7 is connected to a linear motor control circuit 8.

A speed detector 9 is connected to the linear motor control circuit 8, and the optical head 5 detected by the speed detector 9
Is sent to the linear motor control circuit 8. A permanent magnet (not shown) is provided at a fixed portion of the linear motor 6. When the drive coil 7 is excited by the linear motor control circuit 8, the optical head 5 is moved in the radial direction of the optical disc 1.

The optical head 5 is provided with an objective lens 10 supported by a wire or a leaf spring (not shown). The objective lens 10 can be moved in the focusing direction (the direction of the optical axis of the lens) by driving the drive coil 11, and can be moved in the tracking direction (the direction orthogonal to the optical axis of the lens) by driving the drive coil 12. Is possible.

A laser light beam is emitted from the semiconductor laser oscillator 19 by the drive control of the laser control circuit 13. As shown in FIG. 8, the laser control circuit 13 includes a data conversion ROM 51 as a modulation circuit, a selection circuit 52 including a multiplexer, a recording current generation circuit 53, an erase current generation circuit 54, a reproduction current generation circuit 55, and a changeover switch 5.
6, an adder 57, and an amplifier 58.

The data conversion ROM 51 includes a PLL circuit 16
Clock signal for recording (channel clock signal)
The recording data supplied from the error correction circuit 32 is modulated into a signal suitable for recording, that is, 8-16 modulated data in synchronization with the data. The output of the data conversion ROM 51 is supplied to a selection circuit 52.

The selection circuit 52 stores the recording /
Two types of switching signals are output based on the reproduction switching signal and the modulation data from the data conversion ROM 51.
The type of switching signal is supplied to the changeover switch 56.

The recording current generating circuit 53 performs writing (recording).
The erase current generating circuit 54 generates and outputs a laser drive current for erasing. The reproducing current generating circuit 55 generates and outputs a laser driving current for erasing. The output is generated and supplied to the changeover switch 56. As shown in FIG. 9, the laser drive current from each generation circuit increases in the order of reproduction power, erase power, and recording power.

The changeover switch 56 includes two switches 56
a and 56b, and switches 56a and 56b are switched in response to two types of switching signals from the selection circuit 52, so that a recording current generation circuit 53, an erase current generation circuit 54,
Each output from the reproduction current generation circuit 55 is selectively output to the adder 57.

For example, at the time of reproduction, the switch 56a switches the reproduction current generation circuit 55 by a switching signal from the selection circuit 52.
Side and the switch 56b remains off, so that only the reproducing laser drive current from the reproducing current generating circuit 55 is output to the adder 57 via the switch 56a.

At the time of recording, the switch 56a is switched to the erasing current generating circuit 54 by a switching signal from the selecting circuit 52, so that the erasing laser drive current from the erasing current generating circuit 54 is added via the switch 56a. Table 57
Output to Further, the selection circuit 5 corresponding to the modulation data
The switch 56b is repeatedly turned on and off by the switching signal output from the switch 2, so that the recording laser drive current from the recording current generating circuit 53 is added via the switch 56b when the switch 56b is on. Is output to the device 57.

The adder 57 adds the drive current from the changeover switch 56 and outputs the result to the amplifier 58. At the time of reproduction, the reproduction laser drive supplied from the reproduction current generation circuit 55 via the switch 56a is used. The current is output as it is, and at the time of recording, the switch 56a
The erasing laser drive current supplied through the erasing circuit is output, and the erasing laser drive current is supplied to the recording current generation circuit 5.
3 adds the recording laser drive current supplied via the switch 56b and outputs it. Amplifier 58
Is for amplifying the drive current from the adder 57 and supplying it to the semiconductor laser oscillator 19.

The semiconductor laser oscillator 19 is driven by the drive current from the amplifier 58, and the semiconductor laser oscillator 1
From 9, laser beam light of reproduction power, erase power and recording power is irradiated.

Thus, at the time of recording, the previously formed recording portion (amorphous state) is simultaneously erased (crystalline state) by using the laser beam light in which a strong continuous pulse is superimposed on a weak continuous laser beam light, and simultaneously. The above-described state can be realized by so-called overwriting that forms a new recording section. As a result, a strong (writing) laser beam is irradiated at the data "1", and a weak continuous (erasing) laser beam is irradiated at the data "0" to thereby deactivate the data "1". Recording becomes possible as crystalline.

PLL (Phase Locked Loop) circuit 16
Divides a basic clock signal generated from the crystal oscillator 17 by a frequency division value set by the CPU 30 during recording,
As a result, a recording clock signal is generated, and at the time of reproduction, a reproduction clock signal corresponding to the reproduced synchronization code is generated. Further, the PLL circuit 16
In response to a control signal from the PU 30 and a signal from the binarizing circuit 18a of the data reproducing circuit 18, a recording or reproducing clock signal is selectively output.

The laser light beam emitted from the semiconductor laser oscillator 19 is irradiated on the optical disk 1 via the collimator lens 20, the half prism 21, and the objective lens 10. The reflected light from the optical disc 1
0, a half prism 21, a condenser lens 22, and a cylindrical lens 23, and are guided to a photodetector 24.

The photodetector 24 is a four-divided photodetector cell 24
a, 24b, 24c, and 24d. The output signal of the photodetector cell 24a is supplied to one end of the adder 26a via the amplifier 25a. The output signal of the light detection cell 24b is supplied to one end of an adder 26b via an amplifier 25b. The output signal of the light detection cell 24c is
5c is supplied to the other end of the adder 26a. The output signal of the light detection cell 24d is supplied to the other end of the adder 26b via the amplifier 25d.

Further, the output signal of the light detection cell 24a is
The signal is supplied to one end of the adder 26c via the amplifier 25a. The output signal of the light detection cell 24b is supplied to one end of an adder 26d via an amplifier 25b. Photodetection cell 24
The output signal of c is supplied to the other end of the adder 26d via the amplifier 25c. The output signal of the light detection cell 24d is supplied to the other end of the adder 26c via the amplifier 25d.

The output signal of the adder 26a is a differential amplifier OP
2, and the output signal of the adder 26b is supplied to the non-inverting input terminal of the differential amplifier OP. The differential amplifier OP2 outputs a signal related to the focus point according to the difference between the two output signals of the adders 26a and 26b. This output is supplied to the focusing control circuit 27. The output signal of the focusing control circuit 27 is supplied to the focusing drive coil 12. Thus, the laser light beam is controlled to be always just focused on the optical disc 1.

The output signal of the adder 26c is a differential amplifier OP
1, and the output signal of the adder 26d is supplied to the non-inverting input terminal of the differential amplifier OP1. The differential amplifier OP1 outputs a track difference signal according to the difference between the two output signals of the adders 26c and 26d. This output is supplied to the tracking control circuit 28. The tracking control circuit 28 creates a track drive signal according to the track difference signal from the differential amplifier OP1.

The track drive signal output from the tracking control circuit 28 is applied to the drive coil 1 in the tracking direction.
1 is supplied. Further, a track difference signal used in the tracking control circuit 28 is supplied to the linear motor control circuit 8.

By performing the focusing and tracking, each of the light detection cells 24a,
... the sum signal of the output signals of 24d,
The change in the reflectance from the pits (recording data) formed on the track is reflected in the output signal of the adder 26e, which is the addition of the two output signals c and 26d. This signal is supplied to the data reproducing circuit 18. Data reproduction circuit 18
Reproduces recorded data based on a reproduction clock signal from the PLL circuit 16.

The data reproducing circuit 18 demodulates the data by the demodulation circuit 18b based on the binarized signal and the reproduction clock signal supplied from the PLL circuit 16, thereby obtaining the track number as address information from the binarized signal. And the sector number and the recorded data. The reproduced data of the data reproducing circuit 18 is supplied to an error correction circuit 32 via a bus 29.

The error correction circuit 32 corrects an error using an error correction code (ECC) in the reproduced data,
Alternatively, data for parity check is added to the recording data supplied from the interface circuit 35 in units of bytes, and an error correction code (ECC) is added in units of bytes to output to the laser control circuit 13.

Further, the error correction circuit 32 detects an error in byte units from the user data in the reproduced data by the data for parity check, and detects an error of two or more bytes continuously in one sector. At that time,
A replacement control signal is output to the CPU 30 via the bus 29, and a shift register, an adder, a comparison, and a counter are used as the detection circuit.

The reproduced data whose error is corrected by the error correction circuit 32 is transmitted to the bus 29 and the interface circuit 3.
5 is supplied to an optical disk control device 36 as an external device. The recording data emitted from the optical disk control device 36 is transmitted to the interface circuit 35 and the bus 29.
Is supplied to the error correction circuit 32 via the.

When the objective lens 10 is moved by the tracking control circuit 28, the linear motor 6, that is, the optical head 5 is moved by the linear motor control circuit 8 so that the objective lens 10 is located near the center position in the optical head 5. Be moved.

The D / A converter 31 includes a focusing control circuit 27, a tracking control circuit 28, a linear motor control circuit 8, and a CPU 30 for controlling the entire optical disk apparatus.
Used to transfer data between and.

The motor control circuit 4, the linear motor control circuit 8, the laser control circuit 13, the PLL circuit 16, the data reproduction circuit 18, the focusing control circuit 27, the tracking control circuit 28, the error correction circuit 32 and the like are connected via a bus 29. It is controlled by the CPU 30. The CPU 30 performs a predetermined operation according to a program recorded in the memory 2. The memory 2 has a speed table 2a in which speed data values corresponding to the number of rotations of the optical disc 1 for each zone are stored.
And an alternative sector management table 2b in which a sector number not used due to an error in the recording area and a sector number of an alternative area which is an alternative sector of the sector are stored.

Next, the operation at the time of reproduction in the above configuration will be described with reference to the flowchart shown in FIG. For example, when data from a desired sector in the recording area is reproduced (ST1), the error correction circuit 32
If two or more consecutive bytes detect an error,
The replacement control signal is supplied to the CPU 30 via the bus 29 (ST2). As a result, the CPU 30 determines that the reproduced sector is a defective sector (ST3), corrects the error of the reproduced sector data by the error correction circuit 32, and stores the error-corrected data in a substitute sector in the substitute area. Recording is performed, and the sector number of the replacement sector in the replacement area with respect to the sector number in the recording area is stored in the replacement sector management table 2b (ST4).

At this time, the CPU 30 determines that the sector adjacent to the defective sector is also an unusable sector (ST30).
5) Reproduce the data of the sector and record the reproduced data in the substitute sector in the substitute area, and store the sector number of the substitute sector in the substitute area with respect to the sector number in the recording area in the substitute sector management table 2b. (ST6).

That is, when the defective sector is located in the groove, the sectors located on the radially inner and outer lands of the optical disk 1 adjacent to the groove are regarded as unusable sectors, and the recorded contents of those sectors are used. Is recorded in the replacement sector in the replacement area.

Next, the operation at the time of recording will be described with reference to the flowchart shown in FIG. For example, now
The recording data is supplied from the optical disk control device 36, and a recording position of the recording data, for example, a desired sector in a recording area of the optical disk 1 is indicated (ST11).

In response to this instruction, the CPU 30 rotates the motor 3 in accordance with the number of rotations of the corresponding position of the sector, and the error correction circuit 32 gives the parity bit in byte units and the error correction code. The recorded data supplied to the laser control circuit 13 is used to record data in the designated sector in the recording area of the optical disk 1 using the optical head 5 (ST1).
2).

After recording this data, the CPU 30 reproduces the recorded data, compares the reproduced data with the recorded data (ST13), and when an error is detected continuously for two or more bytes (ST13). ST14), the sector in which the data is recorded is determined to be a defective sector (ST15), the recording data is recorded in a substitute sector in the substitute area, and the sector number of the substitute sector in the substitute area with respect to the sector number in the record area is changed. It is stored in the alternative sector management table 2b (ST16).

As described above, in an optical disk in which data is recorded in units of sectors on both lands and grooves, and data recording and erasure of recorded data are repeatedly performed, recording data in a predetermined sector in a recording area is recorded. During playback, when an error of 2 bytes or more is detected consecutively, the data recorded in the sector where the error occurred is recorded in the sector of the alternative area, and the sector where the error occurred corresponds to the land. If the error occurs, the data recorded in the radially adjacent groove sector of the optical disc is also recorded in the alternate area sector, or when the sector in which the error occurs corresponds to the groove,
The data recorded in the sector of the land adjacent in the radial direction of the optical disc is also recorded in the sector of the substitute area.

When recording data is recorded in a predetermined sector in the recording area, the recording data is reproduced, and by comparing the reproduced data with the recorded data, two consecutive data are recorded.
When an error of more than one byte is detected, the recording data is recorded in the sector of the replacement area, and when the sector where the error occurs corresponds to the land, it is recorded in the groove sector adjacent in the radial direction of the optical disk. If the sector in which the error occurred corresponds to the groove, the data recorded in the sector of the land adjacent in the radial direction of the optical disk is also recorded in the sector of the alternative area. It is to be recorded in.

As a result, in an optical disc in which data is recorded in units of sectors on both lands and grooves, and data recording and erasure of recorded data are repeatedly performed, the growth of defects in the radial direction is prevented (defects of defects are prevented). (Propagation in the radial direction can be suppressed), an increase in the number of sectors having defects can be suppressed, and the reliability of the optical disc can be prevented from being impaired.

In the above example, the sector adjacent to the defective sector in the radial direction of the optical disk is also regarded as an unusable sector. However, the present invention is not limited to this, and when an error of 1 byte or more is detected in the adjacent sector, the sector becomes unusable. You may do it.

For example, after judging a defective sector on the land, the recorded data in the sectors of the inner and outer grooves adjacent in the radial direction of the optical disk are also reproduced to determine whether there is an error of 1 byte or more. Judge whether
If there is an error of more than one byte, it is determined that the sector is unusable, the reproduced data of that sector is recorded in the alternative sector in the alternative area, and the sector number of the alternative sector in the alternative area with respect to the sector number in the recording area is managed as an alternative sector. Table 2
b. If there is no error of 1 byte or more, it is set as an available sector and used as it is.

After determining the defective sector of the groove, the recording data of the sectors on the inner and outer lands adjacent to each other in the radial direction of the optical disk are also reproduced to determine whether there is an error of 1 byte or more. If there is an error of 1 byte or more, it is determined as an unusable sector,
The reproduction data of the sector is recorded in the alternative sector in the alternative area, and the sector number of the alternative sector in the alternative area with respect to the sector number in the recording area is stored in the alternative sector management table 2b. If there is no error of 1 byte or more, it is set as an available sector and used as it is.

At this time, if data is not recorded in an adjacent sector, predetermined recording data is recorded, and when an error of 1 byte or more is detected by checking the coincidence between the recording data and the reproduced data. And an unusable sector.

While the optical disk 1 is rotated at a linear velocity of 7.0 m / s by the motor 3, data is recorded on both the land and the groove with a mark length. The recording power is 13 mW, the erasing power is 6 mW, and the data uses random data. This random data is transferred to the optical disk 1
Were repeatedly overwritten to 390 consecutive sectors. The recording area has 390 sectors per track on the inner circumference. Then, 195 sectors of 5 tracks were recorded on the land, and 195 sectors of 5 grooves were recorded thereafter.

Then, the reproduced signal is binarized, and the random data stored in the ROM in the memory 2 is compared to detect an error in each sector. When an error of two or more consecutive bytes was detected in one sector, two recording sectors adjacent to the inner and outer circumferences in the same radial direction as the sector were moved to another sector, and overwriting was repeated again.
As a comparison, an evaluation without performing the above-described defect processing was also performed.

As a result, after overwriting 100,000 times,
In the case where the defect processing is not performed, an error of 20 bytes is detected in the sector of the land address 81, 18 bytes in the sector of the outer groove address 81, 16 bytes in the sector of the inner groove address 42, and further, the outer land address. An error of 10 bytes was detected in the 120 sectors, and a further 9 bytes of the inner land address 42 was detected. Further, an error was detected at the same position on the outer land and groove, and it was confirmed that the error propagated.

However, in the present invention, the land address 5
Sectors of 3 bytes or more were detected in 6,160 sectors, but no error was detected in the sector in the same radial direction of the inner and outer lands, and it was confirmed that no error was propagated.

In the above embodiment, when an error of more than 2 bytes is detected consecutively, it is determined that the sector is a defective sector. However, when an error of more than 2 bytes is detected continuously, a defective sector is detected. It may be determined as a sector.

[0085]

As described above in detail, according to the present invention, in an optical disc in which data is recorded in units of sectors on both lands and grooves, and data recording and erasure of the recorded data are repeatedly performed, It is possible to provide an optical disk device that can prevent the growth of defects in the radial direction, suppress the increase in the number of sectors in which defects exist, and do not impair the reliability of the optical disk.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an optical disk device for explaining an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of an optical disc.

FIG. 3 is a diagram for explaining a format example of an optical disc.

FIG. 4 is a view for explaining a table in which speed data values corresponding to the number of rotations of the optical disc for each zone are stored.

FIG. 5 is a diagram for explaining preformat data in a header section.

FIG. 6 is a diagram showing an example of data recording on an optical disc.

FIG. 7 is a diagram showing a sector format of an optical disc.

FIG. 8 is an electric circuit diagram showing a configuration of a main part of a laser control circuit.

FIG. 9 is a diagram for explaining a reproducing power, an erasing power, and a recording power as laser driving currents.

FIG. 10 is a flowchart for explaining the operation during reproduction.

FIG. 11 is a flowchart for explaining an operation at the time of recording.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk 1 ₁ ... Header part 2 ... Memory 2b ... Alternative sector management table 13 ... Laser control circuit 16 ... PLL circuit 17 ... Crystal oscillator 18 ... Data reproduction circuit 18a ... Binarization circuit 18b ... Demodulation circuit 30 ... CPU 32 ... Error correction circuit 51 Data conversion ROM 52 Selection circuit 53 Recording current generation circuit 54 Erase current generation circuit 55 Reproduction current generation circuit 56 Changeover switch 57 Adder 58 Amplifier

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G11B 20/18 572 G11B 20/18 572F

Claims (8)

[Claims] The present invention has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and includes a header section in which address data is recorded and a data area in which data is recorded. An optical disc device that has a plurality of sectors and records data on an optical disc that includes a recording area composed of a plurality of sectors and an alternative area composed of a plurality of sectors, and reproduces data recorded on the optical disc; Reproducing means for reproducing the data recorded in the data area of the sector; detecting means for detecting an error of the data in byte units reproduced by the reproducing means; While data is being reproduced, an error of 2 bytes or more is continuously detected by the detection means. If the error occurs, the data recorded in the sector where the error occurred is recorded in the sector of the replacement area, and if the sector where the error occurs corresponds to the land, the data of the groove adjacent in the radial direction of the optical disc is recorded. The data recorded in the sector is also recorded in the sector of the substitute area, or when the sector where the error occurs corresponds to the groove, the data recorded in the sector of the land adjacent in the radial direction of the optical disc is also substituted. An optical disk device, comprising: processing means for recording data in a sector of an area. 2. A data processing apparatus comprising: a groove and a land for recording spiral or concentric data; the groove and the land having a fixed length; and a header section on which address data is recorded and a data area on which data is recorded. An optical disc device that has a plurality of sectors and records data on an optical disc that includes a recording area composed of a plurality of sectors and an alternative area composed of a plurality of sectors, and reproduces data recorded on the optical disc; Reproducing means for reproducing the data recorded in the data area of the sector; detecting means for detecting an error of the data in byte units reproduced by the reproducing means; While data is being reproduced, an error of 2 bytes or more is continuously detected by the detection means. If the error occurs, the data recorded in the sector where the error occurred is recorded in the sector of the replacement area, and if the sector where the error occurs corresponds to the land, the data of the groove adjacent in the radial direction of the optical disc is recorded. The data recorded in the sector is also recorded in the sector of the substitute area, or when the sector where the error occurs corresponds to the groove, the data recorded in the sector of the land adjacent in the radial direction of the optical disc is also substituted. Processing means for recording in the sector of the area; and storage means for storing the correspondence between the sector of the recording area in which the data recording position has been changed by the processing means and the sector of the alternative area. Optical disk device. 3. It has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and includes a header section in which address data is recorded and a data area in which data is recorded. An optical disc device that has a plurality of sectors and records data on an optical disc that includes a recording area composed of a plurality of sectors and an alternative area composed of a plurality of sectors, and reproduces data recorded on the optical disc; Recording means for recording data in a data area of a sector in a recording area in byte units; reproducing means for reproducing data in byte units recorded in the data area of the sector by the recording means; Detecting means for detecting an error in the data in a byte unit, and immediately after recording by the detecting means When the recorded data is reproduced and two or more bytes of error are detected consecutively, the data recorded in the sector where the error occurred is recorded in the sector of the substitute area, and the sector where the error occurred corresponds to the land. If the error occurs, the data recorded in the radially adjacent groove sector of the optical disc is also recorded in the alternate area sector, or if the error-occurring sector corresponds to the groove, the data is recorded in the radial direction of the optical disc. An optical disk device, comprising: processing means for recording data recorded in a sector of an adjacent land also in a sector of an alternative area. 4. It has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and includes a header section in which address data is recorded and a data area in which data is recorded. An optical disc device that has a plurality of sectors and records data on an optical disc that includes a recording area composed of a plurality of sectors and an alternative area composed of a plurality of sectors, and reproduces data recorded on the optical disc; Recording means for recording data in a data area of a sector in a recording area in byte units; reproducing means for reproducing data in byte units recorded in the data area of the sector by the recording means; Detecting means for detecting an error in the data in a byte unit, and immediately after recording by the detecting means When the recorded data is reproduced and two or more bytes of error are detected consecutively, the data recorded in the sector where the error occurred is recorded in the sector of the substitute area, and the sector where the error occurred corresponds to the land. If the error occurs, the data recorded in the radially adjacent groove sector of the optical disc is also recorded in the alternate area sector, or if the error-occurring sector corresponds to the groove, the data is recorded in the radial direction of the optical disc. Processing means for recording data recorded in the sector of the adjacent land also in the sector of the alternative area; and storing the correspondence between the sector of the recording area in which the data recording position is changed by this processing means and the sector of the alternative area. An optical disk device comprising: 5. A semiconductor device having a groove and a land for recording spiral or concentric data, comprising a groove or a land of a fixed length, comprising a header section in which address data is recorded and a data area in which data is recorded. An optical disc device that has a plurality of sectors and records data on an optical disc that includes a recording area composed of a plurality of sectors and an alternative area composed of a plurality of sectors, and reproduces data recorded on the optical disc; Reproducing means for reproducing data recorded in the data area of the sector; detecting means for detecting an error in data in byte units reproduced by the reproducing means; and a land or groove sector in the recording area by the reproducing means. When the data recorded in the memory is being reproduced, two bytes are successively detected by the detection means. When an error equal to or more than a byte is detected, data recorded in a sector of a groove or a land adjacent in the radial direction of the optical disk is reproduced by the reproducing means, and whether an error of 1 byte or more is detected by the detecting means is determined. Determining means for determining whether an error of 1 byte or more has been detected, and recording the data recorded in the sector where the error of 2 bytes or more has occurred consecutively in the sector of the alternate area when an error of 1 byte or more is detected. Processing means for recording data recorded in a sector of a groove or a land adjacent to the sector in the radial direction of the optical disk in a sector of an alternative area. 6. It has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and includes a header portion where address data is recorded and a data area where data is recorded. An optical disc device that has a plurality of sectors and records data on an optical disc that includes a recording area composed of a plurality of sectors and an alternative area composed of a plurality of sectors, and reproduces data recorded on the optical disc; Reproducing means for reproducing data recorded in the data area of the sector; detecting means for detecting an error in data in byte units reproduced by the reproducing means; and a land or groove sector in the recording area by the reproducing means. When the data recorded in the memory is being reproduced, two bytes are successively detected by the detection means. When an error equal to or more than a byte is detected, data recorded in a sector of a groove or a land adjacent in the radial direction of the optical disk is reproduced by the reproducing means, and whether an error of 1 byte or more is detected by the detecting means is determined. Determining means for determining whether an error of 1 byte or more has been detected, and recording the data recorded in the sector where the error of 2 bytes or more has occurred consecutively in the sector of the alternate area when an error of 1 byte or more is detected. Processing means for recording data recorded in a sector of a groove or a land adjacent to the sector in the radial direction of the optical disk in a sector of an alternative area; and a recording area in which a data recording position is changed by the processing means. Storage means for storing a correspondence relationship between the sector of the sector and the sector of the replacement area. Disk apparatus. 7. It has a groove and a land for recording spiral or concentric data, is composed of a groove or a land of a fixed length, and includes a header section in which address data is recorded and a data area in which data is recorded. An optical disc device that has a plurality of sectors and records data on an optical disc that includes a recording area composed of a plurality of sectors and an alternative area composed of a plurality of sectors, and reproduces data recorded on the optical disc; Recording means for recording data in a data area of a sector in a recording area in byte units; reproducing means for reproducing data in byte units recorded in the data area of the sector by the recording means; Detecting means for detecting an error in the data in a byte unit, and immediately after recording by the detecting means When the recorded data is reproduced and two or more bytes of errors are detected consecutively, the data recorded in the groove or land sector adjacent in the radial direction of the optical disk is reproduced by the reproducing means. Determining means for determining whether or not an error of more than one byte is detected; and when the error of one or more bytes is detected by the determining means, the error is continuously recorded in the sector in which an error of two or more bytes has occurred. Processing means for recording data in a sector of the substitute area and recording data recorded in a groove or land sector adjacent to the sector in the radial direction of the optical disk to the sector of the substitute area. Optical disk device. 8. A groove and a land for recording spiral or concentric data. The groove and the land have a fixed length. The header and the address area are recorded and a data area where the data is recorded. An optical disc device that has a plurality of sectors and records data on an optical disc that includes a recording area composed of a plurality of sectors and an alternative area composed of a plurality of sectors, and reproduces data recorded on the optical disc; Recording means for recording data in a data area of a sector in a recording area in byte units; reproducing means for reproducing data in byte units recorded in the data area of the sector by the recording means; Detecting means for detecting an error in the data in a byte unit, and immediately after recording by the detecting means When the recorded data is reproduced and two or more bytes of errors are detected consecutively, the data recorded in the groove or land sector adjacent in the radial direction of the optical disk is reproduced by the reproducing means. Determining means for determining whether or not an error of more than one byte is detected; and when the error of one or more bytes is detected by the determining means, the error is continuously recorded in the sector in which an error of two or more bytes has occurred. Processing means for recording data in a sector in the alternative area, and also recording data recorded in a groove or land sector adjacent to the sector in the radial direction of the optical disk to the sector in the alternative area; Storage means for storing a correspondence relationship between a sector of the recording area whose recording position has been changed and a sector of the replacement area. An optical disk device characterized by the following.